Abstract
Parametric optimization was applied to a double-hull AFRAMAX tanker design in order to reduce oil-outflow probability and increase cargo carrying capacity, and the results are presented here. A multi-criteria optimization procedure was set up in modeFrontier ® using the cargo volume, the mean oil-outflow parameter and the steel weight of the cargo block as the objective functions. Calculations are based on a parametric geometric model of the ship created in NAPA ®, and on a structural model created in POSEIDON ®. Integration of the above software packages leads to an automated optimization procedure that provides improved feedback to the designer regarding the trade-off between the various design parameters and optimization criteria involved. The results obtained suggest notable improvements in transport capacity and oil-outflow performance for known, well-established yard designs. The presented work derives from a joint industrial project between Germanischer Lloyd (GL) and the Ship Design Laboratory of the National Technical University of Athens (NTUA-SDL), which continues the work done and coordinated by NTUA-SDL within the SAFEDOR project on the same subject.
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Notes
An optimization with respect to CSR is planned for presentation in the future.
With a 2.5 m side clearance/double-bottom height and an oil-outflow index of about 0.010 (compared to the corresponding MARPOL limits of 2.0 m and 0.015, respectively), the reference design is very environmentally friendly; however, the design shows room for improvement with respect to both cargo carrying capacity and steel weight.
Which is a successful practical design, implemented by a major shipbuilder.
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Papanikolaou, A., Zaraphonitis, G., Boulougouris, E. et al. Multi-objective optimization of oil tanker design. J Mar Sci Technol 15, 359–373 (2010). https://doi.org/10.1007/s00773-010-0097-7
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DOI: https://doi.org/10.1007/s00773-010-0097-7